<template>
    <el-menu
        :default-active="isDefaultActive"
        class="el-menu-vertical-demo"
        background-color="#545c64"
        text-color="#fff"
        active-text-color="#ffd04b"
        :collapse="isCollapse"
    >
        <h3>{{ isCollapse ? '后台' : '通用后台管理系统'}}</h3>
        <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :index="item.path + ''" :key="item.path">
            <i :class="`el-icon-${item.icon}`"></i>
            <span slot="title">{{ item.label }}</span>
        </el-menu-item>
        <el-submenu v-for="item in hasChildren" :index="item.path + ''" :key="item.path">
            <template slot="title">
                <i :class="`el-icon-${item.icon}`"></i>
                <span slot="title">{{ item.label }}</span>
            </template>
            <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
                <el-menu-item @click="clickMenu(subItem)" :index="subItem.path + ''">{{ subItem.label }}</el-menu-item>
            </el-menu-item-group>
        </el-submenu>
    </el-menu>
</template> 
<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
}

.el-menu {
    height: 100%;
    border: none;

    h3 {
        color: #fff;
        text-align: center;
        line-height: 48px;
    }
}
</style>

<script>
export default {
    name: 'CommonAside',
    data() {
        return {
            menu: []
        };
    },
    methods: {
        clickMenu(item) {
            // 由于在 main.js 中全局引入 router,所以此处可以使用 this.$router 进行赋值跳转
            this.$router.push({
                name: item.name
            });
            this.$store.commit('selectMenu', item);
            this.$store.commit('isDefaultActive', item);
        }
    },
    computed: {
        noChildren() {
            return this.asyncMenu.filter((item) => !item.children);
        },
        hasChildren() {
            return this.asyncMenu.filter((item) => item.children);
        },
        isCollapse() {
            return this.$store.state.tab.isCollapse;
        },
        isDefaultActive() {
            return this.$store.state.tab.defaultActive;
        },
        asyncMenu() {
            return this.$store.state.tab.menu;
        }
    }
};
</script>